Search results for "Thermography"

Investigation and modeling of the anomalous yield point phenomenon in pure tantalum

2014

International audience; The monotonic and cyclic behavior of commercially pure tantalum has been investigated at room temperature, in order to capture and understand the occurrence of the anomalous yield point phenomenon. Interrupted tests have been performed, with strain reversals (tensile or compressive loading) after an aging period. The stress drop is attributed to the interactions between dislocations and solute atoms (oxygen) and its macroscopic occurrence is not systematically observed. InfraRed Thermography (IRT) measurements supported by Scanning Electron Microscopy (SEM) pictures of the polished gauge length of a specimen during an interrupted tensile test reveal the nucleation an…

Improvement of building wall surface temperature measurements by infrared thermography

2005

By using quantitative thermal scanning of building surface structures, it is possible to access the temperature field. For further calculation of the heat flux exchanged by these structures with the environment, one must quantify as finely as possible the temperature field on the bodies surfaces. For this purpose we have to take into account that real bodies are not black, which implies that a part of the ambient radiation received by the infrared camera detectors is reflected radiation. In this paper, we present a method to quantify the reflected flux by using an infrared mirror, which allows large surface temperature measurements by infrared thermography under near-ambient conditions with…

Erratum to “Using Infrared thermography in order to compare laser and hybrid (laser+MIG) welding processes” [Optics & Laser Technology 41 (2009) …

2010

Erratum to ‘‘Using Infrared thermography in order to compare laser and hybrid (laser+MIG) welding processes’’ [Optics & Laser Technology 41 (2009) 665–670] Simone Mattei a, , Dominique Grevey , Alexandre Mathieu , Laetitia Kirchner b a Institut Carnot de Bourgogne,UMR5209 CNRS-Universite0 de Bourgogne, IUT Le Creusot, 12 rue de la Fonderie, 71200 Le Creusot, France b EADS France, 12 rue Pasteur, 91 152 Suresnes Cedex, France

Thermal imaging in artificial nonlinear media

1997

A method has been developed to determine the temperature distribution of ferroelectric surfaces and volumes. Based on the nonlinear optical effect of second harmonic generation (SHG) in highly nonlinear ferroelectric coating, demonstration of 2D thermosensing has been performed in the wide temperature range (77 K - 600 K). Physical concept of SHG thermal imaging, design of thermosensitive coating and experimental verification of the method has been discussed.

First lamina hybridization of high performance CFRP with Kevlar fibers: Effect on impact behavior and nondestructive evaluation

2022

The impact behavior of a carbon-Kevlar hybrid composite, widely used in sport car manufacturing, was evaluated. To highlight the hybridization effect, comparative analyses were performed with the basic CFRP laminate having the same lay-up. Tensile, bending and low velocity impact tests, followed by nondestructive inspections, highlighted that Kevlar first lamina hybridization leads to an increment in specific impact strength, up to 55%. To assess the most reliable technique to detect the impact damage, nondestructive evaluation was performed by pulsed thermography, phased array ultrasonic technique, computed tomography and digital radiography. Phased array ultrasonic technique can be consid…

A novel TLC based technique for temperature field investigation in MD channel

2011

Implementation of active infrared NDT techniques using long square heating pulses

2012

The present work describes the implementation of active IR Thermography techniques for the NDT of thick polymer and glass-fibre reinforced polymer (GRP) composite panels. A low cost Thermal NDT set-up is proposed, comprising a single-detector IR camera with low thermal resolution and low frame rate, and common low-power halogen lamps as external heat source devices. The use of halogen lamps in particular requires several seconds of switch-on time in order to deliver meaningful and effective heat quantities. The influence of such long heat deposition intervals is investigated on the possibility to implement Transient Thermography and Lock-In Thermography techniques. Regarding the Transient T…

Contribution to the study and to the optimization of active thermographic process applied to surface crack detection

2017

The aim of this work is the detection of open and subjacent defects in metallic materials using laser-material interaction coupled with infrared thermography. This process is a possible alternative for magnetic particles testing and dye penetrant testing in the field of non-destructive testing. This work is divided into three main parties. At first, we have been interested in the characterization of optical and thermophysical properties of materials we used, in order to have good boundary conditions and also for the needs of temperatures fields measurements for validation. The second part concern the development of a numerical simulation model with two step approach: the first involves mode…

Application of Infrared Thermography in the Assessment of Sport Equipment

2019

Abstract Infrared thermography is a noninvasive imaging technique used to determine surface temperatures under controlled conditions. This technique has many applications in different fields, the assessment of sport equipment being one of them. This chapter aims to provide a general overview of the scientific literature regarding the application of infrared thermography for the assessment of sport equipment. Some examples are provided based on the recent literature and the background experience of the chapter authors in the use of infrared thermography in sport. Examples include the monitoring of formula one (F1) tires during racing, detection of technological doping in cycling, saddle fit …

Footwear outsole temperature may be more related to plantar pressure during a prolonged run than foot temperature.

2021

Objective. The temperature of the sole of the foot has been suggested as an alternative to the measurement of plantar pressure during running despite the scarce evidence about their relationship. The temperature of the footwear outsole could also be representative of plantar pressure distribution due to its less multifactorial dependence. The aim of the study was to determine if plantar pressure during a prolonged run could be related to plantar temperature, either of the sole of the foot or the footwear outsole.Approach. Thirty recreational runners (15 males and 15 females) performed a 30 min running test on a treadmill. Thermographic images of the sole of the foot and the footwear outsole…